What is size on ?

And what about <link rel="meta" type="application/rdf+xml" title="FOAF" href="http://elgg.dev/activity?view=foaf" />? It isn't validating.

Does it validate if you change "meta" to "alternate"?

@sembrestels Regarding size, I think input/file specifies a default size. You can test by validating the file upload page.

@ewinslow I couldn't find any duplicate form IDs. I only found 2 instances of form IDs in Elgg - the group invitation form and the messages reply form.

@cash, Why don't we use <time> instead <abbr> in substitution of <acronym>?

You have an approach here.

Refs: #4273, #3284,

http://caniuse.com/#search=time
IE8 does not support <time>

Ok, I undersand. We can use html5shiv yet, but I understand this is messy and can cause problems.

Html5shim is a fine solution, I think, to the time issue.

Not worth it to add all that for just switching from abbr to time. Shims often have side effects and add bloat. If this was a really essential feature, I could see trying out html5shiv.

I find these reasons less than compelling. It's a tiny well tested library that is only needed for ie8.

I don't find including a library just to switch from <abbr> to <time> compelling - especially since we're talking about radically changing how we handle friendly time in the next version of Elgg.

@cash, I see your insistence and I won't be more boring. Just say that if we want maintain compatibility with IE8, we should include html5shiv anyway.

As <time>, IE8 doesn't support <section>, <article>, <aside>, <hgroup>, <header>, <footer>, <nav>... and community plugins will use them, breaking the compatibility. For this reason, I'd like see html5shiv included in Elgg 1.9.

Moving html5shim discussion to #5492.

I could not find any form id duplicates so closing this. Please open a new ticket for additional validation fixes.